期刊
EUROPEAN JOURNAL OF IMMUNOLOGY
卷 44, 期 3, 页码 807-818出版社
WILEY
DOI: 10.1002/eji.201343806
关键词
CpG-A; CpG-B; pDC; TLR9; Type I IFN
类别
资金
- German Research Foundation [SFB704, SFB670]
- German Research Foundation (Excellence Cluster ImmunoSensation)
- European Research Council [ERC 2009 StG 243046]
Plasmacytoid dendritic cells (pDCs) are responsible for the robust and immediate production of type I IFNs during viral infection. pDCs employ TLR7 and TLR9 to detect RNA and CpG motifs present in microbial genomes. CpG-A was the first synthetic stimulus available that induced large amounts of IFN- (type I IFN) in pDCs. CpG-B, however, only weakly activates pDCs to produce IFN-. Here, we demonstrate that differences in the kinetics of TLR9 activation in human pDCs are essential for the understanding of the functional difference between CpG-A and CpG-B. While CpG-B quickly induces IFN- production in pDCs, CpG-A stimulation results in delayed yet maximal IFN- induction. Constitutive production of low levels of type I IFN in pDCs, acting in a paracrine and autocrine fashion, turned out to be the key mechanism responsible for this phenomenon. At high cell density, pDC-derived, constitutive type I IFN production primes pDCs for maximal TLR responsiveness. This accounts for the high activity of higher structured TLR agonists that trigger type I IFN production in a delayed fashion. Altogether, these data demonstrate that high type I IFN production by pDCs cannot be simply ascribed to cell-autonomous mechanisms, yet critically depends on the local immune context.
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